Carlon Structured Cable Management Systems Handbook - Low Res - Manual (Page 37)

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must not be mixed in the same raceway or box without
a divider or barrier.
EMI PROBLEM IDENTIFICATION
EMI can cause equipment operation problems from
time to time, even when you have properly and carefully
installed a Structured Cable Management System. You
might discover EMI problems through testing after
installation or the equipment users may find problems
later. Once an EMI problem has appeared, the best
place to start is by defining the problem. This can be
done by answering some questions.
• Where does the problem occur?
• What pieces of equipment are affected?
• What are the symptoms, when do they happen,
for how long?
• What standards or contracts apply? Is the
performance within acceptable limits?
• Is there any defective, old or non-compliant
equipment in the area of the affected equipment,
or along the path of the Structured Cable
Management System?
• Does the affected equipment share any power or
signal wiring with some potentially defective, old,
or non-compliant equipment?
• Is there any intrinsically noisy equipment, like a
large industrial motor nearby?
• Is there any improperly installed or ungrounded
cabling within the setup?
• Is the affected equipment unusually sensitive?
WHAT IS THE SOURCE OF THE EMI?
Once you have answered the problem identification
questions, the next step is to track down the source of
the noise.
• Which circuit or individual piece of equipment is the
source of the power behind the noise?
Only something that uses electrical power can
produce EMI. You can often develop a “feel” for
what type of equipment is making the noise through
experience. Hair dryers, fluorescent light fixtures,
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